SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bd8cd872e6cfdf9643c3bd075e6fd62548bac895ab69466f41dfd76247acf2' 
  AND token = 'lTbNzzhOCbBcGl7DUqWz/3VJ96/LOgnNtYtwUOJzgy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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