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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497f23861c07f525a379912b44ff17147e12c48a16357efc6c53db016dbcd31d' 
  AND token = '9Is8zp25qkCn7dy9aKpNHcz0S98JzhLNbndQXF74EfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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