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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3ba08acbdcb802f976a5ac493aebb7ec840ce902902bf20c3a197bf4d460fb' 
  AND token = '3IxTusb+QR7vw89YH2KA5TgDlYZCZo804x2AxRmNu9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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