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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9eb49ef9d3ab5875793c17bf27614c5ab4722d3e5d373b961d611c720c37219' 
  AND token = '61NlLrrsqfo9/5UXIyOGYRuuleQhWyCbTqBl0IHzsz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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