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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18125e47174a439747afc00a5411be9cd8aa5b451e275bac419fe38e2f5572c4' 
  AND token = 'XQO2JgQ0ZBmUJ0Jow/3Pfk9RN4ikLqbZh0V8O54Vvu0=' 
  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"
    }
  }
}