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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03915a0575ec99200a6559aa3b3dbdd45a73c939aa8ee4f9a32ed3145ee1e25' 
  AND token = 'OcmRXd6ogl3kZ96Vq8SZuqjnjqKsEHZS1RcAGm0M99w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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