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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0c9425321eeb57fe6ab692a2d4d00aac2933be13f20e576b38f93ae13f1a71' 
  AND token = 'UmFWCy1gsWi65bE2nhhp8GjT673yPE0u7q4PbzMQwvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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