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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0291f53c7fc45725d477e52d8b97d64bbc5da729e32b171d26d3df6e181f0fcd' 
  AND token = '2dUKcEl1XiIrO0V9jOqdz6ynYzTIczthlNWWleZXsuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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