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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd443b8cd9de02087600adce9db813d07e46cf5fd2294823ca525766b5c6ab35b' 
  AND token = 'MjyL3s1U1vH08bTIdhZgNv8PtPxg587QOlXNo2dFS5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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