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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da55b0de4c9cfd751f1d6319342978090498c853dad77f946026e612818e374c' 
  AND token = 'sExTLRpVoNN2UM/TGKHLTgWVaaN+0KgPQCePh9LaL/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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