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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fefb235dded810308669b91dabcbc626db1b86d0799ba60959929fa6b461399' 
  AND token = 'BSW90nqtutncRLXX5r1KhfauXwiyB8rIl80ACw7xg7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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