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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934832914ac030c90d3aba08fc6387ebb3de461abb4c16fa470907db82f79ffe' 
  AND token = 'd9FijZv7y1Wj4UNPWDpE9lRMdzR8C3WuPEbi0iNhtSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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