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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6565b8fc44ca369efc8c01b8131e9c97a6f2565d1793c98d6e68783ba3a564e7' 
  AND token = 'Ar4Zcpf8oSXaWcFW+UmbVgEqDV2XnZRzTELg+acIogo=' 
  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"
    }
  }
}