SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd162d51113b878c32037c304a9528121f8c95e946aada8321d085d9c42f5749d' 
  AND token = 'k5O/89+8sMw6Bzhm/sgKQY2oHRbKnHvuIOfpyCacrsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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