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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc702d16c5b63f547bf582d36a5a85fd59c3490801ce4dca85d4bb82dd33165' 
  AND token = 'IDgnTc/XS5XwNhb7KI1XMk2k83jtdbzL2bND8jwTSfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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