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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a8fb30e93e23a7e64eee15a404e5c06df2466b4db4c444fb1f2bb2eb3ed48e' 
  AND token = 'IYQOaXNqDj4ez6PkZrn9ZbIRPDbJnwZBBo5kwse3jCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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