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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7e6cf071f84f13eb0e96ca6dccfb05e8a66603704c29582ee1be5ca5a40c96' 
  AND token = 'TKtzZ/DIfROad09RY1y7SlfErEuChw505NR0oM8iQlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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