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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb433fd21dff29a819578344bb300157278ee5bb738c21bc78be2be72fa5e3cb' 
  AND token = 'W6v84xkj22IXs7hJX/sg28SrYrXH16bt2vDiwMuiD3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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