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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990c3696b6be7a2d22ea951fdbf64c7a2caf53d724c73e45f10465b02d7dd2af' 
  AND token = 'M9Bksl9v72xr+w54PfmAP1zoLfG+SI4CFlVFZheGGns=' 
  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"
    }
  }
}