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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05f69dc814c1f05bfd3f27f093a85ac56588c0361f52553040ad52a1693c9c8' 
  AND token = '/Ew3du1vLO72o6NC+to478ReXjQ1Apynd5tItBkZWyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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