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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f7adf8a98c9e55ad111fced0960689074e0e34a81274cbcd33cf9c89042659' 
  AND token = 'qXka41/zxHOz0QnIE7m8s3licXkb3cx9PQESyZiWa7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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