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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d789067404f233049c836092e26a926b7725f88157c319e64d804ad36e285e3' 
  AND token = '89TlUy+AO2o7TvELcxrJ8o2jsfObsJv8XRoXRMjJb9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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