Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c116a455460db114cbe634bfdfdf9f9ce08e9e26d1f5eae59d0403b4c4b49b0a' 
  AND token = 'vWEmU+jmiY3BiyLB1y883JfAB9KQS8H5DR1zUfsB+h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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