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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0c494ec41e9ff1b40220cd777c8861daf9ab5d1b83b638c0130f4e9ebf5f24' 
  AND token = 'Zm1ou+aGRk44S4Rh6ovGFBujcVXkM8vMHtAB/S1EOLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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