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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75291650a21e74da321b8c1e45412076daaccb26dbf123bd372b6c78c8520324' 
  AND token = 'raezfqvL1vQYF7KLGPX6MQ/nxfx6FfaCxfxRovP3gQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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