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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5c6f5c96324a4199189994bba9938c456444ed9e3dab93d3edbf155c1cf0b3' 
  AND token = 'a23GEGA6soimpU4BUJMwGN1q4zcrzAFLbJ8ZGKagTB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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