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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0164d4239d2fb78dea00944df4566a2f6ebfa009f26280a35b36c8949471624f' 
  AND token = 'lEKbYlEf/NmR0P3xDzMK7VWw/YjCbfD+U21HUAJSBx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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