SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e9328c1cc7c4639268e0c0500cf7b23541446d05b93d51459079c51815ffa9' 
  AND token = 'hZ/dfsXHJ2vHgM1w2mKpbMFvzodfZgVhU+WIRioxJmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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