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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf48017ca2f5d4d31184ffd992e1baf66ee256cc983fb28986f6126859a43481' 
  AND token = '+KK5QkIaac+hxzUf8DaY77qRDQXHn9n5v71/WlSX61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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