Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27eae6877cf4277d65836264f047e350f4c940f7bcbe094cc68a2494996d1cd3' 
  AND token = 'k6hzGCqIKNTPLNE88dYfn8ZUqgvfAK3p1dZdTMKjtZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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