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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4713da55f7f6e76a692d5426fd2eca8b2e70c80d3f1762f75cadbc30ec49ad6c' 
  AND token = '1V9xz3skwmJNu2VuJ/3TyXxneuKttE/pO0SzusggWQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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