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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f3f8ff6b3f132a4ce8aa9877975d1a259ee648b5cac59cb2d097526bbc55dd' 
  AND token = '4IoYEKhA4GBHr7n9+Ca6sqDeYMLIEaB2vAENeJuR37U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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