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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4f7fa794c54a8f36c98586e51d3dcb251aa6665870d71030ff552421ce7b11' 
  AND token = 'HN16GZEenYt4cZjg9sC3XuJ2k1bsUpDUlPUW8wZujKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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