Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf7d4270a135488996f46e5c5c3385f29797668a050f16be7f86a8147f553e6' 
  AND token = 'tPB66SX/e3oqmjXQbBR4ooSCIwcPir362BSxOGgkQ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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