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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62df5a1e1d42cbb822de8c365cb22852b5680b86ec96a135c86613bc71e8678' 
  AND token = 'kFnxoA/7ZWHIbBTRF30/uarQODtKYibV9nuAZBDfMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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