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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d102a2d49a198e685148f880fc5a791e938648bca92ff1044b62ea9b3386ee' 
  AND token = 'zSCciUdM7AambzU1yOVWGHVYjBJcrK0HD7Z4G5eWQj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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