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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fb0a61c39c608fb1c60a7b60aae363cf8e851e147ae350d48e491a6b6ecff3' 
  AND token = 'uqFMvxh6K7ZN0M/POuseOdErqKgmUmrQV1hTxf2Hy1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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