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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17bf26b81a704b8b37b3033cce2922c67b11ec1b6fa9bb14535a3103712c629' 
  AND token = 'ii6rNeyoOGr0ZHigs47ELhZ6nuGhmx96y/nrXs5QCNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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