Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a0dd300530e0d13dbe41bd29a54d0556d662817d8c5fcf0b635b1a334b359e' 
  AND token = '2YQv6xsCV9OVs3M9vwt3SAW4lhhVDTWHvjk2KCJ3l/I=' 
  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"
    }
  }
}