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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfd13daa44dc575e0a376b9d00de9d58fc8e5cfba75c05f96ba9b04bfe23e3b' 
  AND token = 'ChEinbHI+muXCMnWvr/5shb4wjOCOM7K5Hz8EBxRNeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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