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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee4f492d5a243ec63ed4c89d79fd98cdd8bb6eddd07f26ce5532df8bd0159a0' 
  AND token = 'KYsucAEfTK5F7S4Jr8hWRXGIY6uqN0QmC7LKjkh4iqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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