Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3149a6b1b873bacc1fdd321335f2f3b10bbcf1e8b69ac85faf5a7de807793f89' 
  AND token = '6SDPFzIRKt8UlzMGCL97ZEBJcWfSL9aeiJ3mpaUSyxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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