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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f0da8e78e8d83272e3ea63147fee22f34f83730c51786a17f2ad11fd882188' 
  AND token = 'znHYeEjJ1yMr+uVahE3N/S+y1dmIDRArTdX3x3778bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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