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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483b05b6b17a655f2b2df2bcddccd5ae2a9eaa21f8d8125278d74c9ede816513' 
  AND token = 'xocP+IEI2E2opbhgbE6qdospsfr4CS3pLn0RhP9wVNw=' 
  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"
    }
  }
}