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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d1be4eb11e45ae26e7fd0010f7609f169963b60de0edf95629aef8c3362e95' 
  AND token = 'SY1ODSwTbOnFrI+5Vs7rlH+wdp07/xWMYIEItaIWxYc=' 
  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"
    }
  }
}