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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d69452c75311c87e3c14c646182e565addbe676adb2c025031fa50bf3a6987' 
  AND token = 'MJbxYLTJv7FigSVE63TpbpdCwRTbey6W/fhywn/A1PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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