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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdfa0f52c576abb8e7aaf2dc4d4797e996eba69fd4db3203424d226cdc6abc3' 
  AND token = 'RIRiy4GBVF8CyzkzMkiqfPStiMuFo0Wy6MkVEaM/PDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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