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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d30890cc9eb4848020df5851932bdea26b3f796d89de6c75f154d819eb33e0' 
  AND token = 'J2IMXm9cvCaFs91IqR/d1ZtAVmfK7f/ub6rY/KOGmUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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