SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e132756c69326a46890cb504e8397611ecdd3a8ad851b530b3c083b22e3389' 
  AND token = 'pG0pYIV2dv4LypQnYB/DsjPyWkuONqkhwwUsqV5YrZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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