Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29083ce25e9fa4f3a80643c2a283b86dba69be1988ffa652deec46b579bda4f9' 
  AND token = 'D2833Q3NFxmt+TOefhs1HrvJr9VVRDj94R0NvZNpiYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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