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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7def3834db2aa5d0816a11d3bb84988ff9c2719412c2aa9ec77916fa16da06' 
  AND token = '5wvfmA8gyCDV3Rgx9Ur4GmdOBw9NiDGuTkPEKgF6ONo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}