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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b954abd71e4c03da50662658bf3218f615aa1841cae7bf92ac35f9eb89bf375d' 
  AND token = 'kfZkLZQIxGJuh9LrfA6sDZ4N66kir3tf9atOBRXDCEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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