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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7254822b3c92943bc05933f34c1925ec35ed0aba69ad732bf6a446952797b42' 
  AND token = 'KUOILf0kio4D+bCrk/sbIWgdWwuQlY9Jrqut3hB+7sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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