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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2baedeb68b4814bd93c2e80a61e9d72a709e4e03756e341dcca3ed7b65d5d343' 
  AND token = '7nhJFcgga0ZCJ3CvaEhM3K2j7rBJlLRlfVOb3jzMse8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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