Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46282fdd1006abf24398dd2e5b7dfc8b28f0c30dbe30da69baf11ffe9dcdc3b' 
  AND token = 'xvetN5uCk1oAqS1Aixwwbu9VAQ0gUFVmDB120SjBPUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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