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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d0ba7da0462aeb323b859f4f97a0dbb47a619c9d85b7b79289f5221b08de3b' 
  AND token = 'A+akpu99bx7Xfh42xugydBmPBAv9chu7IJzLhjCwm9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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