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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f013c6633d4a3f99e02e17b06efe77a70c1765d6055a8ec8f78839649a590a' 
  AND token = 'vcz1WPll8z5rDMRI/t5UxhXECBgyBFnAD8ToungR7U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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