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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c04485fe81a388c1e92bd764504eccdb018b99f2f2f4e5682ccc405cfed9ba8' 
  AND token = 'usDu54PJOxfxaA6zMnPk8oaPmLHxLEKFn6kcVO4oLyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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