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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1169d0de185c0afd8cc31d556c67bd209e28bd437764117c7d1421bb2f98f515' 
  AND token = 'KpqcuFd5m8NHNA9p/2BNShh5kYE3afYJF6b9k6MBbU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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