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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ff6506a80735fbb2fc9823306bd64721454d063758064ab1b9ff0c2375b6e7' 
  AND token = 'vMKHOPxpRr0RyifO38lnUbMRcqDlvIal50Yxw2Fox4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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